# operator-(ranges::chunk_view::outer-iterator)

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< cpp‎ | ranges‎ | chunk view‎ | outer iterator

friend constexpr difference_type operator-( std::default_sentinel_t s, const /*outer-iterator*/& i ) requires ranges::sized_sentinel_for<ranges::sentinel_t<V>, ranges::iterator_t<V>>; | (1) | (since C++23)
friend constexpr difference_type operator-( const /*outer-iterator*/& i, std::default_sentinel_t s ) requires ranges::sized_sentinel_for<ranges::sentinel_t<V>, ranges::iterator_t<V>>; | (2) | (since C++23)

Calculates the distance (in number of chunks) between the iterator and sentinel.

Let `parent_` be the underlying pointer to enclosing `chunk_view`.

1) Equivalent to:

    const auto dist = ranges::end(i.parent_->base_) - *i.parent_->current_;
    if (dist < i.parent_->remainder_)
        return dist == 0 ? 0 : 1;
    return /*div-ceil*/(dist - i.parent_->remainder_, i.parent_->n_) + 1;

2) Equivalent to: return -(s - i);.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when `std::ranges::chunk_view::outer-iterator` is an associated class of the arguments.

### Parameters

i | - | the iterator
s | - | the sentinel

### Return value

The distance between given iterator and sentinel.

### Example

| This section is incomplete Reason: no example

### See also

operator++ (C++23) | increments the iterator (public member function)

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